Wrench



April 22, 1924. 1,490,903

" G. B. ANDERSON WRENCH original Filed Jan. 21, 1921 @n gf.

Patented Apr. 22, 1924.

" UNITED STATES PATENT OFFICE.

WRENCH. i

'application' aieazanuary 21, 1921, serial 110.433,93?. Renewed Januaryas, 1924.

To aZZwLom t may concern.' y

Be it known that I, GEORGE BnFoRD AN- DnRsoN, a subject of the `King ofGreat Britain, and resident of Detroit, Michigan, have invented certainnew and useful Improvements in Wrenches, of which the following` is aspecification;

The invention relates to improvements in wrenches as described inthedpresent specification and shown in the accompanying drawings thatform a part of the same.

The invention consists essentially o the novel construction andarrangement of parts whereby a wrench of the type in,` which theadjusting nut is movable laterally by means of a lever, is provided withmeans for transformin the rotary pressure of said lever to a longituinal pressure against said nut.

The objects of the invention are to facilitate the operation of thewrench by reducing to a minimum the friction between the movable parts,to lengthen the life of the wrench, to permit of the rovision of a newdisc from time to time wit out the necessity of replacing the nut, andgenerally to provide a wrench which will be inexpensive to manufacture,efficient in operation, and durable.

In the drawings Figure 1 is a side view of the wrench, a portion beingbroken away to show the arrangement of the otherwise concealed parts.

Figure 2 is an edge view of the wrench.

Figure 3 is a cross sectional view taken on the line A-A of Figure 2.

Figure 11 is a side elevation of the movable jaw.

Figure 5 is an end view of the movable jaw.

Figure 6 is a perspective view of the disc interposed between theadjusting nut and the lever used to eiect the lateral movement of saidnut.

Like numerals of reference indicate corresponding parts in the variousfigures.

Referring to the drawings A represents the main portion of theWrench,comprising a head 1 having an integral jaw 2 from one sidethereof and an integral handle 3 from the side opposite the rigid jaw 2.y

f1 is a movable jaw having atongue 5 slidable in a lateral opening 6through the head 1 to permit of adjusting said jaw 4 in relation to saidjaw 2, said tongue 5 being threaded as at 7 along the under edgethereof.

8 is a worm nut rotatably mounted in a transverse cut 9 in the head 1 ona fixed pin l0, said nut being somewhat shorter than said cut or' gap 9yand being adapted to` mesh with the threads 7 of the tongue 5 and uponrotation imparting longitudinal movement to the movable jaw 4 inrelationto the rigid iaWQ. n As the gap 9 isof greater length than thenut 8 it will beapparent that said nut,vthe tongue 5 and the yjaw `daremovable laterally in relation to the jaw 2 without thel necessity ofrotatinglsaid'nut, thus `making it possible to adjust the y pressure ofthe jaws on the nut or other object being gripped without rotating thescrew-8. Y f

"Thethread'of the nut 8 is preferablymof substantially ldisc form, thatis to say, having one of its walls, designated by the numeral 8, ofstraight construction and having its other side provided with a slightbevel as at 8b, so that pressure brought to bear on the end of said nutcorresponding to the bevelled side of the thread will tend to lock saidthread firmly into the notches or threads in the tongue 5 and thuseliminate all possibility of said tongue and said nut being forcedapart.

12 is a lever having offset parallel end arms 13 adapted to project'over opposite sides of the section A and beingv pivoted intermediate oftheir length to said section. and the, side of the gap 9 adjacent to thehandle as indicated by the numeral 14, said arms being provided withcomparatively small inwardly odset fingers 15 adapted to bear towardsthe end of the worm nut 8 upon the outer end of the lever being drawntowards the handle 3.

16 is a coil spring encircling the pin 10 between the end of the nut 8farthest from the fingers 15 and the end of the gap 9 and exertingpressure on said nut to hold the jaw 4 to its extended position.

It is necessary to provide a means for eliminating the friction betweenthe nut 8l and the fingers 15 caused by the rotary motion imparted tosaid fingers upon the compression of the lever 12 and to this end a disc17 of greater thickness than the width of an .individual thread of thetongue 5 and having a concaved end 18 adapted to substantially followthe general contour of the under side of the tongue 5, is looselymounted on the pin 10 between the end of the nut 8 and the fingers 15 sothat when the lever 12 and the handle 3 are compressed said washer ordisc will receive the rotary or rictional pressure of the fingers 15While the nut 8 will receive even pressure over the whole end surfacethereof.

In the operation of the vinvention the jaws are first adjusted by meansof the nut 8 to approximately the size of the object to be turned andthe wrench is grasped with the handle 3 next the palm of the hand.

The jaws are then placed over the object to be'turned and the lever l2drawn inwardly towards the handle 3 causing the tingers l5 to bear witha rotary movement against a comparatively small portion of the surfaceof the disc'l which permits of even longitudinal pressure being impartedto the nut 8 forcing said nut and consequently the jaw 4 towards therigid jaw 2 and closing said jaws firmly over saidobject.

To take a fresh grip on the object the pressure kon the lever 12 isrelieved and the wrench swung around to the desired posif tion when thejaws are again brought together to firmly engage the object by renewedpressure on said lever. The jaws 2 and 4 may be provided with Anotches19 thus permitting of grips being taken y,either on 2a theliat orcorners of va nut as desired.

What I claim is A wrench comprising a handle terminating in a head'forming onejaw and having a substantially rectangular worm slot and atrack for the movable jaw, a movable jaw having a rack base projectinginto saidslot, and slidably arranged on said track, a screw nut freelyturning on a fixed shaft across said slot and vengaging said rack Vforadjusting said movable jaw, a stop slidably `arranged on said shaft andengaging said nut `'and shaped to clear said rack and a lever handlespring-held to its open position and havin an offset engaging Vsaid:sliding stop an" pivotally secured to the aforesaid handle.

Signed at the cityV of Toronto, this 13th day of December, 1920.

GEORGE BURFORD ANDERSON.

Witnesses:

W. G. HAMMOND, G. MURPHY.

